<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>
//var newElement = document.createElement('label'); 
//newElement.setAttribute('value', 'Username:');
var e = document.getElementById('inputtext').value; 
alert(e);
e.appendChild("ffffffffffffffffff");
</script>
</head>

<body>
<form action="" method="get"><input name="" type="text" id="inputtext" value="aaa" /><input name="" type="submit" value="提交" />
</form>
</body>
</html>
